since we want to create an index on the referencing column, I am working on firing a 'CREATE INDEX' query programatically right after the 'CREATE TABLE' query
The problem I ran into is how to specify my Strategy (GinContainsElemStrategy) within the CREATE INDEX query. For example: CREATE INDEX ON fktable USING gin (fkcolumn array_ops) Where does the strategy number fit?
The patch is attached here, is the approach I took to creating an index programmatically, correct?
Could you, please, specify idea of what you're implementing in more detail? AFACS, you're going to automatically create GIN indexes on FK array columns. However, if we don't do this for regular columns, why should we do for array columns? For me that sounds like a separate feature which should be implemented for both regular and array FK columns.
Regarding your questions. If you need to create index supporting given operator, you shouldn't take care about strategy number. Strategy number makes sense only in opclass internals. You just need to specify opclass which support your operator. In principle, you can find all of them in pg_amop table. Alternatively you can just stick to GIN array_ops.
In general the approach you create index looks OK. It's OK to manually create DDL node and execute it. As you can see, this is done in many other places of backend code.
------ Alexander Korotkov Postgres Professional: http://www.postgrespro.com The Russian Postgres Company